If you have the liquid yeast, and the capability to make a starter I would strongly suggest doing so.

That said, Wyeast 1056 is an American Ale yeast strain, you probably wouldn't be too far off if you used some Safale US-05.

I'm not sure how to make a starter, I'll do some research on that. Being my first brew ever thought dry would be easier. A starter probably requires some time and I have no idea how long the process will last.